> It sounds like the best option would be to have a generic function
> called skb_reallic_head_and_tail_room which allocated either or both
> as required, and define a pair of macros called skb_realloc_headroom
> and skb_realloc_tailroom which just called the generic function with
> an extra zero parameter for the unwanted area...
This is a bad idea because it would add unnecessary checks in important
fast paths (packet forwarding) - because it unlikely that gcc will be smart
enough to remove the redundant checks.
-Andi
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